Deformed bar



"June 26, 1923. 0 1,400,000

G. BAEHR DEFORMED BAR Filed July 22. 1919 WITNESSES Patented June 26, 1923.

. STATES lacunae GEORGE BAEHR, OF CORAOPOLIS, PENNSYLVANIA.

I DEEORMED Bars.

. Application fii aaui 22, 1919. Seriallfl'o. 312,494.

Deformed Bars, of which the following is a specification. i

This invention relates to a reinforcing bar for use in concrete constructions. The objects of the invention is to provide. a bar for this purposeso formed that the strong coarse particles of the. aggregate and not merely the weak grouting can come into intimate Contact with large wedge shaped surfaces on the bar, whereby the bar is more fficiently anchored in the concrete; to provide a bar which is of substantially uniform cross section throughout, and one which is easy to roll, by means of rolls in which the grooves are not subject to as much wear and abrasion as the grooves for forming deformed bars heretofore made.

In the accompanying drawings Fig. 1 is a side view of the preferred form of the bar; and Figs. 2, 3 and 4 are cross sections taken respectively on the lines 2-2, 33, and 4tt, Fig. 1.

As shown in the drawings the bar is provided with portions 1 and 2 which are 30 polygonal in cross section, the drawings showing the same as substantially square in cross section and the alternate portions 1 and 2 displaced (circumferentially of the bar) relative to each other at an angle of approximately 15 so that a diameter between opposite flat faces 3 of the portions 1 are substantially in the same plane (longitudinally of the bar) as diameters between opposite angles 4: of the portions 2, and likewise, the diameters between opposite fiat faces 5 of the portions 2 are substantially in the same plane as diameters between opposite angles 6 of the portion 1. I Adjacent square portions are connected by transition r sections or portions 7 which, in the embodiment illustrated, are octagonal in cross section, that is, formed of a series of wedgeshaped faces, such as the faces 8 which slope from the ends of the fiat faces 3 of the sec tions 1 and merge into the angles a of sections 2, and reversely arranged wedge-shaped faces 9 which slope from the flat faces 5 of sections 2 outwardly and merge into the angles 6 of the-sections 1. These wedge-shaped faces are of considerable length, as shown,

and form inclined shoulders or abutments to resist movement of the rod longitudinally in the concrete. particularly the gradual sloping wedgeshaped surfaces shown permit the strong coarse particles of the aggregate, suchasthe coarse pebbles of gravelor the coarse portions of broken stone,'to come into intimate contact therewith, so that under tension of. the bar these wedge faces press against these strong largeparticles of the aggregate.

In all forms of deformed reinforcing bars heretofore used, the main body has been provided with closely spaced ridges or grooves arranged either longitudinally,

The large surfaces, and

[ATNT 'oFrIc E.-Q,

transversely or diagonally of the bar, as a consequence of which the large strong particles of the aggregate do not come into intimate contact with the shoulders or abutments, but only the finer portions of the cement and the grouting comes into contact with such surfaces. The result is that the Weak grouting only is put under shear stresses. l/Vith the improved bar, however,

the shear stresses act directly against the strong coarse particles of the aggregate,and,

put the concrete under compression stress chiefly. Furthermore, the bar described is of substantially uniform cross sections through out, as a result of which of the metal thereof is used for tensile strength. As distinguished. from prior bars in which a certain percentage of the metal is used for bonding alone. 1

Furthermore, the roll grooves for forming the improved bars are of relatively uniform section, not presenting any abrupt depressions or projections which quickly become abraded or worn ed by the hot metal when rolling. Consequently rolls for form ing the improved bar last much longer than rolls for producing reinforcing bars of the form heretofore used.

It is obvious that modifications can be made in the cross sectional shape of the bar and in the length of the various sections and the proportions and shape thereofwithout departing from the invention.

1 claim:

1. A reinforcing bar for concrete having portions thereof square incross section,successive portions also square in cross section and turned at 45 to the first portions, and

transition portions between said square sections, said transitionportions being octagonal in cross section and er substantially the same area in cross section as the square portions.

2. A rolled reinforcing bar for concrete section and'turned at 45 to the first portions, and transition portionsbetween said successive rectangular 'SGCtlOIlS, said transltion portions being of substantially the same area at any cross section as the cross section of the rectangular: portions.

4. A rolled reinforcing bar for concrete, formed into a succession of non-circular body portions with intermediate transition portions, each of said body portions having its median planes extending through the axis of the bar and'positioned at an angle to corresponding median axial planes of the two adjacent body portions, the bar at all points being of substantially the same area in cross-section, the exterior of the bar be ing shaped to provide a non-straight surface-intersection line by any axial plane of the bar. a

In testimony whereof, I have hereunto set my hand.

GEORGEBAEHR.

Witnesses CHAS. H. STEVENSON, HOWARD L.. SNIVELY; 

